Formation of Ions | Grade 9 Science Quarter 2 Week 3 | MELC Based

hi students welcome back to my strong techie youtube channel it's already week 3 in our grade 9 science quarter 2 lesson today's video lesson is the continuation of our week 2 lesson if you haven't watched our week 2 lesson about chemical bonding you may click the link in the description box below our topic for today is about formation of ions at the end of this video lesson you are going to explain how ions are formed so please keep on [Music] watching let us start let us define first what ions are ions are simply charged atoms they are neither positive nor negative meaning they do not have charge because the number of protons is equal to the number of electrons next how are ions formed [Music] ions are formed as atoms gains or lose electrons metals tend to lose electrons because they have low electronegativity take note class that electronegativity is the ability of the atom to attract electrons when an atom loses electrons it will form a positively charged ion and it is called cat ions for example sodium is a metal element that tends to lose one valence electron it will form a positively charged sodium ion or a cut ion next non-metals tend to gain electrons because they have higher electronegativity remember that the higher the electronegativity the higher it is to attract or gain electrons when an atom gain electrons it will form a negatively charged ion called an ions for example chlorine chlorine is a non-metal element it can gain an electron from a metal element such as sodium to form a negatively charged chlorine ion take note class the number of electrons an atom gains or loses is its valence so it is important that you know how to get the number of valence electrons or the electrons in the outermost shell but don't worry you can determine the number of valence electron by simply looking at the group number in the periodic table of elements take note of this image [Music] again class metal atoms tend to lose electrons and form a positively charged ion called cat ion non-metal atoms tend to gain electrons and form a negatively charged ion called an ion how do you assign names for an ion [Music] unlike a cat ion which is named for the parent atom an an ion is named by taking the root name of the atom and changing the ending for example chlorine ion taking the root name and changing the ending into it will now be chloride or chloride ion another one is fluorine into fluoride ion next ion charges in the periodic table of elements [Music] we find our periodic table very useful when we want to know what type of ion is formed by a given atom as shown in your screen right now note that the group 1 metals all form one positive ions the group 2 metals all form two positive ions non-metals on the other hand form negative ions by gaining electrons [Music] how do you write chemical formulas with ions whenever a compound forms between a metal and a non-metal it can be expected to contain ions we call these substances ionic compounds [Music] for example sodium ion is written in this form chlorine ion is in this form together it is sodium chloride each sodium ion has one positive charge and chlorine ion has a one negative charge so they must occur in equal numbers to give a net charge of zero it is very important to remember that a chemical compound must have a net charge of zero this means that if a compound contains ions then there must be both positive ions or cat ions and negative ions are what we call an ions present and the numbers of cat ions must be such that the net charge is zero that is all for our lesson for today i hope you learned something new about the formation of ions do not hesitate to comment down below your questions and clarifications and if this helped you do not forget to like share and subscribe thanks for watching bye [Music] [Music] so [Music] [Music] [Music] do [Music] foreign

Channel: Maestrang Techy

Views: 113,878

Keywords: Chemistry, Grade 9 Science, DEPED based lesson, Melc Science, Quarter 2 LEssons, Ions, Anions, Cations, Valence electrons, Chemical Compounds, Chemical Formulas, Naming an anion, Ionic Bonding, Covalent Bonding

Id: xzd-njYcLRE

Length: 8min 12sec (492 seconds)

Published: Tue Jan 19 2021